Hi there.. Iam having Blackberry 8120 Pearl... which does having the OS 4.3....
long back I upgraded my os to 4.5 but the volume was so less to hear..... Hence I roll backed to 4.3....... But the problem is OS 4.3 doesn't have 'Docs To Go'. So I tried to install 'Docs to go' manually.... I was succeeded. ( When I installed os 4.5 on my PC I backed up the .alx and .cod files and loaded through the application loader.)........ But recentry I reinstalled my os and Docs To Go has gone....... So I tried to reinstall it manually but I was unable to do that. Its showing the errors...... ( I mean to say that I can install those manually but word to go is not opening.. I can open sheet to go and slide show to go......).

And I downloaded the software 4.6 and 5.0 OS which is for 8220....... I tried to install on my 8120 in many ways but its not taking...... is there any trick to install OS 4.6 or 5.0 on BB 8120 Pearl........